648901949 has 8 divisors (see below), whose sum is σ = 676523232. Its totient is φ = 621850320.

The previous prime is 648901931. The next prime is 648901987. The reversal of 648901949 is 949109846.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 648901949 - 2²⁰ = 647853373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 648901897 and 648901906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648901919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140087 + ... + 144644.

It is an arithmetic number, because the mean of its divisors is an integer number (84565404).

Almost surely, 2^648901949 is an apocalyptic number.

It is an amenable number.

648901949 is a deficient number, since it is larger than the sum of its proper divisors (27621283).

648901949 is a wasteful number, since it uses less digits than its factorization.

648901949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284827.

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 648901949 is about 25473.5539138142. The cubic root of 648901949 is about 865.7510485058.

The spelling of 648901949 in words is "six hundred forty-eight million, nine hundred one thousand, nine hundred forty-nine".